Unit 1 Darwin’s big ideas and ways of working Darwin’s big ideas and ways of working: Unit 1.
Ideas that shaped Darwin’s thinking. Prior to Darwin’s Theory of Evolution there were 4...
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Transcript of Ideas that shaped Darwin’s thinking. Prior to Darwin’s Theory of Evolution there were 4...
Ideas that shaped Darwin’s thinking
Prior to Darwin’s Theory of Evolution there were 4 scientists that had their own ideas and theory’s
1. Hutton 2.Lyell3.Lamarck4. Malthus
The Rock Boys!!
The Math guy!
Helped scientists understand that Earth is many millions of years old
Processes that changed the Earth in the past are the same processes that operate in the present
In Lyell’s book: Principles of Geology
Rock Cycle: Volcanoes and Earthquakes
Erosion continues to carve out canyons.
Uniformitarianism: the natural laws and processes that operate in the universe now, have always operated in the past.
UniformitarianismHow do you pronounce that??
Use or disuse of organs, organisms acquired or lost certain traits during their lifetime.
Traits could then be passed on to their offspring.
Malthus reasoned that if the human population continued to grow unchecked, sooner or later there would be insufficient living space and food for everyone.
Do you remember: Density Independent factors Density dependent factors
He theorized that there was a “carrying capacity” in every habitat/ environment
Populations will naturally get checked by famine, disease etc.
1. Change over time, common ancestor Pre-existing variation
2. Variation within a population or species Everyone is just a little different
3. Natural selection Survival of the fittest
1. Fossil Record
2. Geographical Distribution
3. Similarities in Structure Homologous/Analogous Structures
4. Vestigial organs
5. Similarities in Early development Embryology
Yes, I can support it!
Preserved remains or markings left by organisms that lived in the past are called fossils.
Position of fossils can reveal their age.
Younger
Older
Organisms in different parts of the world shared similarities
Homologous structure: same basic structure but different function
Analogous structure: same basic function, but do not have the same basic structure
Homologous structures: similar structures but have different function
Derived from a common ancestor
Ex. Forelimb
Analogous structures: similar function but not similar in structure
Not derived from a common ancestor
Ex. A butterfly wing and a bird wing
Organs of many animals are so reduced in size that they are just vestiges, or traces, of homologous organs in other species
I have toe nails!!!
Common pattern in the development In their early stages, chickens,
turtles, and rats look similar, providing evidence that they shared a common ancestor
Adopt an Embryo!
Select one embryo to adopt as your own!!
Adopt an Embryo!
1 2 3 4 5 6 7 8
Stage 2
1 2 3 4 5 6 7 8
Stage 3
1. Fossil Record
2. Geographical Distribution
3. Similarities in Structure Homologous/Analogous Structures
4. Vestigial organs
5. Similarities in Early development Embryology
Yes, I can prove it!
HOMOLOGOUS STRUCTURE
Same Structure different function
ANALOGOUS STRUCTURE
Same function different structure
Instructions:1.Read2.Define3.Color4.Chart5.Answer Questions